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<a href="#GtkCurve.synopsis" class="shortcut">Top</a>
                 | 
                <a href="#GtkCurve.description" class="shortcut">Description</a>
                 | 
                <a href="#GtkCurve.object-hierarchy" class="shortcut">Object Hierarchy</a>
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                <a href="#GtkCurve.implemented-interfaces" class="shortcut">Implemented Interfaces</a>
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<div class="refentry" lang="en">
<a name="GtkCurve"></a><div class="titlepage"></div>
<div class="refnamediv"><table width="100%"><tr>
<td valign="top">
<h2><span class="refentrytitle"><a name="GtkCurve.top_of_page"></a>GtkCurve</span></h2>
<p>GtkCurve — Allows direct editing of a curve</p>
</td>
<td valign="top" align="right"></td>
</tr></table></div>
<div class="refsynopsisdiv">
<a name="GtkCurve.synopsis"></a><h2>Synopsis</h2>
<pre class="synopsis">

#include &lt;gtk/gtk.h&gt;

                    <a class="link" href="GtkCurve.html#GtkCurve-struct" title="GtkCurve">GtkCurve</a>;
<a class="link" href="GtkWidget.html" title="GtkWidget">GtkWidget</a>*          <a class="link" href="GtkCurve.html#gtk-curve-new" title="gtk_curve_new ()">gtk_curve_new</a>                       (void);
void                <a class="link" href="GtkCurve.html#gtk-curve-reset" title="gtk_curve_reset ()">gtk_curve_reset</a>                     (<a class="link" href="GtkCurve.html" title="GtkCurve">GtkCurve</a> *curve);
void                <a class="link" href="GtkCurve.html#gtk-curve-set-gamma" title="gtk_curve_set_gamma ()">gtk_curve_set_gamma</a>                 (<a class="link" href="GtkCurve.html" title="GtkCurve">GtkCurve</a> *curve,
                                                         <a
href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gfloat"
>gfloat</a> gamma_);
void                <a class="link" href="GtkCurve.html#gtk-curve-set-range" title="gtk_curve_set_range ()">gtk_curve_set_range</a>                 (<a class="link" href="GtkCurve.html" title="GtkCurve">GtkCurve</a> *curve,
                                                         <a
href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gfloat"
>gfloat</a> min_x,
                                                         <a
href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gfloat"
>gfloat</a> max_x,
                                                         <a
href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gfloat"
>gfloat</a> min_y,
                                                         <a
href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gfloat"
>gfloat</a> max_y);
void                <a class="link" href="GtkCurve.html#gtk-curve-get-vector" title="gtk_curve_get_vector ()">gtk_curve_get_vector</a>                (<a class="link" href="GtkCurve.html" title="GtkCurve">GtkCurve</a> *curve,
                                                         int veclen,
                                                         <a
href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gfloat"
>gfloat</a> vector[]);
void                <a class="link" href="GtkCurve.html#gtk-curve-set-vector" title="gtk_curve_set_vector ()">gtk_curve_set_vector</a>                (<a class="link" href="GtkCurve.html" title="GtkCurve">GtkCurve</a> *curve,
                                                         int veclen,
                                                         <a
href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gfloat"
>gfloat</a> vector[]);
void                <a class="link" href="GtkCurve.html#gtk-curve-set-curve-type" title="gtk_curve_set_curve_type ()">gtk_curve_set_curve_type</a>            (<a class="link" href="GtkCurve.html" title="GtkCurve">GtkCurve</a> *curve,
                                                         <a class="link" href="gtk-Standard-Enumerations.html#GtkCurveType" title="enum GtkCurveType">GtkCurveType</a> type);
</pre>
</div>
<div class="refsect1" lang="en">
<a name="GtkCurve.object-hierarchy"></a><h2>Object Hierarchy</h2>
<pre class="synopsis">
  <a
href="/usr/share/gtk-doc/html/gobject/gobject-The-Base-Object-Type.html#GObject"
>GObject</a>
   +----<a
href="/usr/share/gtk-doc/html/gobject/gobject-The-Base-Object-Type.html#GInitiallyUnowned"
>GInitiallyUnowned</a>
         +----<a class="link" href="GtkObject.html" title="GtkObject">GtkObject</a>
               +----<a class="link" href="GtkWidget.html" title="GtkWidget">GtkWidget</a>
                     +----<a class="link" href="GtkDrawingArea.html" title="GtkDrawingArea">GtkDrawingArea</a>
                           +----GtkCurve
</pre>
</div>
<div class="refsect1" lang="en">
<a name="GtkCurve.implemented-interfaces"></a><h2>Implemented Interfaces</h2>
<p>
GtkCurve implements
 AtkImplementorIface and  <a class="link" href="gtk-gtkbuildable.html#GtkBuildable">GtkBuildable</a>.</p>
</div>
<div class="refsect1" lang="en">
<a name="GtkCurve.properties"></a><h2>Properties</h2>
<pre class="synopsis">
  "<a class="link" href="GtkCurve.html#GtkCurve--curve-type" title='The "curve-type" property'>curve-type</a>"               <a class="link" href="gtk-Standard-Enumerations.html#GtkCurveType" title="enum GtkCurveType">GtkCurveType</a>          : Read / Write
  "<a class="link" href="GtkCurve.html#GtkCurve--max-x" title='The "max-x" property'>max-x</a>"                    <a
href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gfloat"
>gfloat</a>                : Read / Write
  "<a class="link" href="GtkCurve.html#GtkCurve--max-y" title='The "max-y" property'>max-y</a>"                    <a
href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gfloat"
>gfloat</a>                : Read / Write
  "<a class="link" href="GtkCurve.html#GtkCurve--min-x" title='The "min-x" property'>min-x</a>"                    <a
href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gfloat"
>gfloat</a>                : Read / Write
  "<a class="link" href="GtkCurve.html#GtkCurve--min-y" title='The "min-y" property'>min-y</a>"                    <a
href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gfloat"
>gfloat</a>                : Read / Write
</pre>
</div>
<div class="refsect1" lang="en">
<a name="GtkCurve.signals"></a><h2>Signals</h2>
<pre class="synopsis">
  "<a class="link" href="GtkCurve.html#GtkCurve-curve-type-changed" title='The "curve-type-changed" signal'>curve-type-changed</a>"                             : Run First
</pre>
</div>
<div class="refsect1" lang="en">
<a name="GtkCurve.description"></a><h2>Description</h2>
<div class="note" style="margin-left: 0.5in; margin-right: 0.5in;">
<h3 class="title">Note</h3>
<p>
 This widget is considered too specialized/little-used for
 GTK+, and will in the future be moved to some other package.  If
 your application needs this widget, feel free to use it, as the
 widget does work and is useful in some applications; it's just not
 of general interest. However, we are not accepting new features for
 the widget, and it will eventually move out of the GTK+
 distribution.
</p>
</div>
<p>
The <a class="link" href="GtkCurve.html" title="GtkCurve"><span class="type">GtkCurve</span></a> widget allows the user to edit a curve covering a range of
values. It is typically used to fine-tune color balances in graphics
applications like the Gimp.
</p>
<p>
The <a class="link" href="GtkCurve.html" title="GtkCurve"><span class="type">GtkCurve</span></a> widget has 3 modes of operation - spline, linear and free.
In spline mode the user places points on the curve which are automatically
connected together into a smooth curve. In linear mode the user places points
on the curve which are connected by straight lines. In free mode the user can
draw the points of the curve freely, and they are not connected at all.
</p>
</div>
<div class="refsect1" lang="en">
<a name="GtkCurve.details"></a><h2>Details</h2>
<div class="refsect2" lang="en">
<a name="GtkCurve-struct"></a><h3>GtkCurve</h3>
<pre class="programlisting">typedef struct _GtkCurve GtkCurve;</pre>
<p>
The <a class="link" href="GtkCurve.html#GtkCurve-struct" title="GtkCurve"><span class="type">GtkCurve</span></a> struct contains private data only, and
should be accessed using the functions below.
</p>
</div>
<hr>
<div class="refsect2" lang="en">
<a name="gtk-curve-new"></a><h3>gtk_curve_new ()</h3>
<pre class="programlisting"><a class="link" href="GtkWidget.html" title="GtkWidget">GtkWidget</a>*          gtk_curve_new                       (void);</pre>
<p>
Creates a new <a class="link" href="GtkCurve.html" title="GtkCurve"><span class="type">GtkCurve</span></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody><tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>a new <a class="link" href="GtkCurve.html" title="GtkCurve"><span class="type">GtkCurve</span></a>.
</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<a name="gtk-curve-reset"></a><h3>gtk_curve_reset ()</h3>
<pre class="programlisting">void                gtk_curve_reset                     (<a class="link" href="GtkCurve.html" title="GtkCurve">GtkCurve</a> *curve);</pre>
<p>
Resets the curve to a straight line from the minimum x and y values to the
maximum x and y values (i.e. from the bottom-left to the top-right corners).
The curve type is not changed.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody><tr>
<td><p><span class="term"><em class="parameter"><code>curve</code></em> :</span></p></td>
<td>a <a class="link" href="GtkCurve.html" title="GtkCurve"><span class="type">GtkCurve</span></a>.
</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<a name="gtk-curve-set-gamma"></a><h3>gtk_curve_set_gamma ()</h3>
<pre class="programlisting">void                gtk_curve_set_gamma                 (<a class="link" href="GtkCurve.html" title="GtkCurve">GtkCurve</a> *curve,
                                                         <a
href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gfloat"
>gfloat</a> gamma_);</pre>
<p>
Recomputes the entire curve using the given gamma value.
A gamma value of 1 results in a straight line. Values greater than 1 result
in a curve above the straight line. Values less than 1 result in a curve
below the straight line. The curve type is changed to <code class="literal">GTK_CURVE_TYPE_FREE</code>.
FIXME: Needs a more precise definition of gamma.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>curve</code></em> :</span></p></td>
<td>a <a class="link" href="GtkCurve.html" title="GtkCurve"><span class="type">GtkCurve</span></a>.
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>gamma_</code></em> :</span></p></td>
<td>the gamma value.
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<a name="gtk-curve-set-range"></a><h3>gtk_curve_set_range ()</h3>
<pre class="programlisting">void                gtk_curve_set_range                 (<a class="link" href="GtkCurve.html" title="GtkCurve">GtkCurve</a> *curve,
                                                         <a
href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gfloat"
>gfloat</a> min_x,
                                                         <a
href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gfloat"
>gfloat</a> max_x,
                                                         <a
href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gfloat"
>gfloat</a> min_y,
                                                         <a
href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gfloat"
>gfloat</a> max_y);</pre>
<p>
Sets the minimum and maximum x and y values of the curve.
The curve is also reset with a call to <a class="link" href="GtkCurve.html#gtk-curve-reset" title="gtk_curve_reset ()"><code class="function">gtk_curve_reset()</code></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>curve</code></em> :</span></p></td>
<td>a <a class="link" href="GtkCurve.html" title="GtkCurve"><span class="type">GtkCurve</span></a>.
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>min_x</code></em> :</span></p></td>
<td>the minimum x value.
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>max_x</code></em> :</span></p></td>
<td>the maximum x value.
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>min_y</code></em> :</span></p></td>
<td>the minimum y value.
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>max_y</code></em> :</span></p></td>
<td>the maximum y value.
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<a name="gtk-curve-get-vector"></a><h3>gtk_curve_get_vector ()</h3>
<pre class="programlisting">void                gtk_curve_get_vector                (<a class="link" href="GtkCurve.html" title="GtkCurve">GtkCurve</a> *curve,
                                                         int veclen,
                                                         <a
href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gfloat"
>gfloat</a> vector[]);</pre>
<p>
Returns a vector of points representing the curve.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>curve</code></em> :</span></p></td>
<td>a <a class="link" href="GtkCurve.html" title="GtkCurve"><span class="type">GtkCurve</span></a>.
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>veclen</code></em> :</span></p></td>
<td>the number of points to calculate.
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>vector</code></em> :</span></p></td>
<td>returns the points.
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<a name="gtk-curve-set-vector"></a><h3>gtk_curve_set_vector ()</h3>
<pre class="programlisting">void                gtk_curve_set_vector                (<a class="link" href="GtkCurve.html" title="GtkCurve">GtkCurve</a> *curve,
                                                         int veclen,
                                                         <a
href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gfloat"
>gfloat</a> vector[]);</pre>
<p>
Sets the vector of points on the curve.
The curve type is set to <code class="literal">GTK_CURVE_TYPE_FREE</code>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>curve</code></em> :</span></p></td>
<td>a <a class="link" href="GtkCurve.html" title="GtkCurve"><span class="type">GtkCurve</span></a>.
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>veclen</code></em> :</span></p></td>
<td>the number of points.
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>vector</code></em> :</span></p></td>
<td>the points on the curve.
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<a name="gtk-curve-set-curve-type"></a><h3>gtk_curve_set_curve_type ()</h3>
<pre class="programlisting">void                gtk_curve_set_curve_type            (<a class="link" href="GtkCurve.html" title="GtkCurve">GtkCurve</a> *curve,
                                                         <a class="link" href="gtk-Standard-Enumerations.html#GtkCurveType" title="enum GtkCurveType">GtkCurveType</a> type);</pre>
<p>
Sets the type of the curve. The curve will remain unchanged except when
changing from a free curve to a linear or spline curve, in which case the
curve will be changed as little as possible.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>curve</code></em> :</span></p></td>
<td>a <a class="link" href="GtkCurve.html" title="GtkCurve"><span class="type">GtkCurve</span></a>.
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>type</code></em> :</span></p></td>
<td>the type of the curve.
</td>
</tr>
</tbody>
</table></div>
</div>
</div>
<div class="refsect1" lang="en">
<a name="GtkCurve.property-details"></a><h2>Property Details</h2>
<div class="refsect2" lang="en">
<a name="GtkCurve--curve-type"></a><h3>The <code class="literal">"curve-type"</code> property</h3>
<pre class="programlisting">  "curve-type"               <a class="link" href="gtk-Standard-Enumerations.html#GtkCurveType" title="enum GtkCurveType">GtkCurveType</a>          : Read / Write</pre>
<p>Is this curve linear, spline interpolated, or free-form.</p>
<p>Default value: GTK_CURVE_TYPE_SPLINE</p>
</div>
<hr>
<div class="refsect2" lang="en">
<a name="GtkCurve--max-x"></a><h3>The <code class="literal">"max-x"</code> property</h3>
<pre class="programlisting">  "max-x"                    <a
href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gfloat"
>gfloat</a>                : Read / Write</pre>
<p>Maximum possible X value.</p>
<p>Default value: 1</p>
</div>
<hr>
<div class="refsect2" lang="en">
<a name="GtkCurve--max-y"></a><h3>The <code class="literal">"max-y"</code> property</h3>
<pre class="programlisting">  "max-y"                    <a
href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gfloat"
>gfloat</a>                : Read / Write</pre>
<p>Maximum possible value for Y.</p>
<p>Default value: 1</p>
</div>
<hr>
<div class="refsect2" lang="en">
<a name="GtkCurve--min-x"></a><h3>The <code class="literal">"min-x"</code> property</h3>
<pre class="programlisting">  "min-x"                    <a
href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gfloat"
>gfloat</a>                : Read / Write</pre>
<p>Minimum possible value for X.</p>
<p>Default value: 0</p>
</div>
<hr>
<div class="refsect2" lang="en">
<a name="GtkCurve--min-y"></a><h3>The <code class="literal">"min-y"</code> property</h3>
<pre class="programlisting">  "min-y"                    <a
href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gfloat"
>gfloat</a>                : Read / Write</pre>
<p>Minimum possible value for Y.</p>
<p>Default value: 0</p>
</div>
</div>
<div class="refsect1" lang="en">
<a name="GtkCurve.signal-details"></a><h2>Signal Details</h2>
<div class="refsect2" lang="en">
<a name="GtkCurve-curve-type-changed"></a><h3>The <code class="literal">"curve-type-changed"</code> signal</h3>
<pre class="programlisting">void                user_function                      (<a class="link" href="GtkCurve.html" title="GtkCurve">GtkCurve</a> *curve,
                                                        <a
href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gpointer"
>gpointer</a>  user_data)      : Run First</pre>
<p>
Emitted when the curve type has been changed.
The curve type can be changed explicitly with a call to
<a class="link" href="GtkCurve.html#gtk-curve-set-curve-type" title="gtk_curve_set_curve_type ()"><code class="function">gtk_curve_set_curve_type()</code></a>. It is also changed as a side-effect of
calling <a class="link" href="GtkCurve.html#gtk-curve-reset" title="gtk_curve_reset ()"><code class="function">gtk_curve_reset()</code></a> or <a class="link" href="GtkCurve.html#gtk-curve-set-gamma" title="gtk_curve_set_gamma ()"><code class="function">gtk_curve_set_gamma()</code></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>curve</code></em> :</span></p></td>
<td>the object which received the signal.
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>user_data</code></em> :</span></p></td>
<td>user data set when the signal handler was connected.</td>
</tr>
</tbody>
</table></div>
</div>
</div>
<div class="refsect1" lang="en">
<a name="GtkCurve.see-also"></a><h2>See Also</h2>
<p>
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody><tr>
<td><p><span class="term"><a class="link" href="GtkGammaCurve.html" title="GtkGammaCurve"><span class="type">GtkGammaCurve</span></a></span></p></td>
<td><p>a subclass for editing gamma curves.</p></td>
</tr></tbody>
</table></div>
<p>
</p>
</div>
</div>
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